CollectionViewSource - uneven grouping

Im using the WPF-Toolkit DataGrid with an CollectionViewSource as Source. With PropertyGroupDescriptions I can create and display groups in the Grid. My problem is that i cannot create "uneven" groups, like:

• A
  • A.A
  • A.B
• B 开发者_Go百科
  • B.A
  • B.B
    • B.B.A
    • B.B.B
• C
• D

I want some groups that are deeper than other, and some, that are only elements (C and D) and no groups. I hope it is undestandable...

Has someone an idea to solve this? Thanks!

Sounds like you need to use a TreeView and HierarchicalDataTemplate?